Econo Modified

randy wilson · 01-16-2014, 09:59 PM

We never had a cam spec in spec, which was our top class. But we had a .500 lift max in stock, .600 inch max in modified stock, and stock option. It was easy to check with a dial indicator at the valve. The Brodix spec head for Ford, Chevy, and Mopar will only except 1.55 springs, nothing larger. I think a .700 lift max at the valve will save money on valve train in spec. I found no performance difference with a cam basically in that range with a spring at 350# on the seat, and 850# over the nose, then with a spring at 285# on the seat, and 675# over the nose. So, I think it would take a lot of expense out of the valve train. Now then, if you allow unlimited lift, however, it would come into play. We were successful in turning 9,600 rpm with the lighter springs, you just had to stay on top of them. I don't care either way on rev kits. I won't use one, but I say go for it. There is less HP with one installed, so I don't think it's an issue.

01-16-2014, 09:59 PM	#11
randy wilson Senior Member Join Date: Jan 2007 Location: N/A Posts: 882 Likes: 0 Liked 22 Times in 22 Posts	Re: Econo Modified We never had a cam spec in spec, which was our top class. But we had a .500 lift max in stock, .600 inch max in modified stock, and stock option. It was easy to check with a dial indicator at the valve. The Brodix spec head for Ford, Chevy, and Mopar will only except 1.55 springs, nothing larger. I think a .700 lift max at the valve will save money on valve train in spec. I found no performance difference with a cam basically in that range with a spring at 350# on the seat, and 850# over the nose, then with a spring at 285# on the seat, and 675# over the nose. So, I think it would take a lot of expense out of the valve train. Now then, if you allow unlimited lift, however, it would come into play. We were successful in turning 9,600 rpm with the lighter springs, you just had to stay on top of them. I don't care either way on rev kits. I won't use one, but I say go for it. There is less HP with one installed, so I don't think it's an issue. __________________ don,t have one Last edited by randy wilson; 01-16-2014 at 10:06 PM.